Production Of Chi(C1) And Chi(C2) In P(P)Over-Bar Collisions At Root S=1.8 Tev

T. Affolder, H. Akimoto, A. Akopian,M. Albrow, P. Amaral,S. Amendolia, D. Amidei, K. Anikeev, J. Antos, G. Apollinari,T. Arisawa,T. Asakawa,W. Ashmanskas, F. Azfar,P. Azzi-Bacchetta, N. Bacchetta,M. Bailey,S. Bailey,P. de Barbaro, A. Barbaro-Galtieri,V. Barnes, B. Barnett,S. Baroiant,M. Barone, G. Bauer, F. Bedeschi, S. Belforte,W. Bell, G. Bellettini, J. Bellinger, D. Benjamin,J. Bensinger, A. Beretvas,J. Berge, J. Berryhill,B. Bevensee, A. Bhatti,M. Binkley, D. Bisello,M. Bishai,R. Blair,C. Blocker,K. Bloom, B. Blumenfeld,S. Blusk, A. Bocci,A. Bodek,W. Bokhari, G. Bolla,Y. Bonushkin, D. Bortoletto, J. Boudreau,A. Brandl,S. van den Brink,C. Bromberg,M. Brozovic,N. Bruner,E. Buckley-Geer, J. Budagov,H. Budd, K. Burkett,G. Busetto,A. Byon-Wagner,K. Byrum, P. Calafiura, M. Campbell,W. Carithers,J. Carlson, D. Carlsmith,W. Caskey,J. Cassada, A. Castro, D. Cauz, A. Cerri,A. Chan,P. Chang,J. Chapman, C. Chen,Y. Chen,M.-T. Cheng, M. Chertok, G. Chiarelli,I. Chirikov-Zorin,G. Chlachidze, F. 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Wester, A. Wicklund, E. Wicklund,T. Wilkes,H. Williams,P. Wilson,B. Winer, D. Winn,S. Wolbers,D. Wolinski,J. Wolinski, S. Wolinski,S. Worm,X. Wu,J. Wyss, A. Yagil, W. Yao,G. Yeh,P. Yeh, J. Yoh,C. Yosef,T. Yoshida, I. Yu,S. Yu,Z. Yu, A. Zanetti,F. Zetti,S. Zucchelli

PHYSICAL REVIEW LETTERS（2001）

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摘要

We have measured the ratio of prompt production rates of the charmonium states chi (c1) and chi (c2) in 110 pb(-1) of p (p) over bar collisions at roots = 1.8 TeV. The photon from their decay into J/Psi gamma is reconstructed through conversion into ece pairs. The energy resolution this technique provides makes the resolution of the two states possible. We find the ratio of production cross sections sigma chi (c1)/sigma chi (c1) = 0.96 +/- 0.27(stat) +/- 0.11(syst) for events with p(T)(J/Psi) > 4.0 GeV/c, /eta (J/Psi)/ < 0.6, and p(T)(gamma) > 1.0 GeV/c.

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